BRUSSELS, Dec. 17 - The International Monetary Fund estimates Ukraine needs another $15 billion in financing to withstand an economic crisis but the European Union has only limited capacity to help, European Commission President Jean-Claude Juncker said on Wednesday, Reuters reported.

Ukrainian Prime Minister Arseny Yatseniuk appealed to the EU in Brussels this week for urgent financial aid. He says Ukraine, facing a pro-Russian rebellion in eastern territories that has killed over 4,700 people and disrupted the economy, risks defaulting unless Western donors come up with more funds.